Table 2.

Estimates of $N_e^{*}$, the effective population size required to explain morphological shifts by drift alone.

Trait	All FP	FP1	FP2
Wing	101–456	108–489	54–242
Tail	34.4–155	34–153	36–161
Tarsus	835–3,766	804–3,625	1,215–5,480
Bill length (P)	13–57	13–58	11–52
Bill depth (A)	7–31	7–30	7–32
Bill width (A)	192–865	241–1,086	43–195
PC1	9–38	8–37	11–51
PC2	25–113	28–126	7–32

Lower estimates are calculated with a generation time of three years and heritability estimates of 0.2, and upper estimates calculated with a generation time of 2 years and heritability estimates of 0.6. Underlined values show cases where $N_{e\left(h\right)}>N_e^{*}$, and drift can be rejected as the sole mechanism of differentiations.